Seems you don't have enough user rights to install OpenOffice. You need to be logged in as an administrator in order to do so.If you are doing the install under an administrator account, check the security settings of the folder you are trying to install to.

Other ideas:

Do you have the current version of Microsoft Installer (MSI) running? It should be distributed via Microsoft Update. You may also want to check KB Article 893803.

You could also try to run the Microsoft Windows Installer Clean Up utility which is available in KB Article 290301.

Finally, you could try to run a registry cleaning utility like CCleaner.